Switch to standard integer types in sync/.

sync/test/mock_invalidation_tracker.h

Index: sync/test/mock_invalidation_tracker.h
diff --git a/sync/test/mock_invalidation_tracker.h b/sync/test/mock_invalidation_tracker.h
index ee1f74060f6da6017f09f5298732d325512317fc..7a155220db60d249e7df30766119fde679995bd2 100644
--- a/sync/test/mock_invalidation_tracker.h
+++ b/sync/test/mock_invalidation_tracker.h
@@ -5,6 +5,8 @@
 #ifndef SYNC_TEST_MOCK_INVALIDATION_TRACKER_H_
 #define SYNC_TEST_MOCK_INVALIDATION_TRACKER_H_
 
+#include <stdint.h>
+
 #include <set>
 #include <string>
 
@@ -21,7 +23,7 @@ class MockInvalidationTracker {
   // object.
   scoped_ptr<TrackableMockInvalidation> IssueUnknownVersionInvalidation();
   scoped_ptr<TrackableMockInvalidation> IssueInvalidation(
-      int64 version,
+      int64_t version,
       const std::string& payload);
 
   MockInvalidationTracker();